48 Agilent U1251A/U1252A User’s and Service Guide
2 Making Measurements
Testin g D io de s
To test a diode, turn the circuit power off, and remove the
diode from the circuit. After that, proceed as follows:
1 Set the rotary switch to .
2 Connect the red and black test leads to input terminals
and COM respectively.
3 Use the red probe lead on the positive terminal (anode) of
the diode and the black probe lead on the negative
terminal (cathode).
4 Read the display.
5 Reverse the probes and measure the voltage across the
diode again. Diode test result is based on the following:
• Diode is considered good if the meter displays “OL” in
reverse bias mode.
• Diode is considered shorted if the meter displays
approximately 0 V in both forward and reverse bias
modes, and the meter beeps continuously.
• Diode is considered open if the meter displays “OL” in
both forward and reverse bias modes.
CAUTION
Disconnect circuit power and discharge all high-voltage capacitors before
testing diodes to prevent possible damage to the meter.
NOTE
The cathode is the side with band(s).
NOTE
The meter can display diode forward bias of up to approximately 2.1 V.
Typical diode forward bias is between the range of 0.3 to 0.8 V range.
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